<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let sum= 0
        for(let num=0;num<=1000;num++){
            sum=sum+num
            }
            document.write(`1-1000累加的值是${sum}`)

    </script>
</body>
</html>